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<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
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<H3><A NAME="HDRDXAA" HREF="progu097.htm#PToC_201">DXAllocateArray</A></H3>
<A NAME="IDX1548"></A>
<A NAME="IDX1549"></A>
<P><STRONG>Function</STRONG>
Allocates space for the data items of an Array.
<P><STRONG>Syntax</STRONG>
<PRE><STRONG>
&#35;include &lt;dx/dx.h&gt;
Array DXAllocateArray(Array a, int n)
</STRONG>
</PRE>.
<P><STRONG>Functional Details</STRONG>
This routine allocates to Array <TT><STRONG>a</STRONG></TT> the space
for at least <TT><STRONG>n</STRONG></TT> items.
It increases efficiency because it allocates space in advance,
eliminating the need to allocate additional space at a later
time.
It is most useful when you can specify the maximum number of items
that will be added.
The routine changes only the amount of space allocated to Array
<TT><STRONG>a</STRONG></TT>, not the <I>number of items</I>
in it (only <TT><STRONG>DXAddArrayData</STRONG></TT> can
do that).
<P><B>Note: </B>In the ideal case of knowing the <I>exact</I> number of items
the Array will require, you can call <TT><STRONG>DXAddArrayData(a, o, n,
NULL)</STRONG></TT>, which will allocate the right amount of space
for the specified number of items (<TT><STRONG>n</STRONG></TT>).
The allocation routine detailed here, on the other hand, is for creating
Arrays when this information is <I>not</I> exact.
<P><STRONG>Return Value</STRONG>
Returns <TT><STRONG>a</STRONG></TT> or returns <TT><STRONG>NULL</STRONG></TT>
and sets an error code.

		<P><STRONG>See Also</STRONG>
<TT><STRONG>
<A HREF="progu100.htm#HDRDXAAD">DXAddArrayData</A>,
<A HREF="progu335.htm#HDRDXT">DXTrim</A>, <A HREF="progu335.htm#HDRDTI">DXTrimItems</A>, </STRONG></TT><A HREF="progu046.htm#HDRIRREG">"Irregular Arrays"</A>.

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